Red is optimal from a self preservation perspective but is also the antisocial option. Picking blue saves everyone.
OR. Red is for people who understand statistics, blue is for people who like to gamble.
Red is for people who don't think beyond the end of their nose. Okay, you're very smart and understand statistics, but what about the following groups: friends, family, spouses? If they don't pick red, and they die, would you say life is completely fine because there's less "dumb" people or would you possibly think: "hmm, it kinda sucks that they died, maybe I should've picked blue?"
GP is correct that red is the anti-social / myopic option.
Why wouldn't they?
When we suspect some people are not cooperative then it gets reciprocated
Everyone picking red saves everyone.